NMR Studies on Magnetic Impurity Effect in Type II Superconductors
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概要
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The nuclear spin-lattice relaxation T^1 of Al^<27> in a type II superconductor La_<3-x>Gd_xAl has been mesured as a funcition of concentration of Gd impurity, x, as well as temperature and magnetic field. The experimental result can be understood well on the basis of the current theory of magnetic field induced gapless superconductivity in the limit, as in the case of V_3Sn previously published by us. Relaxation rate in superconducting state in the case of x=0.2 at.% is a decreasing function of the external magnetic field. This anomalous relaxation behavior is contrary to the case of spin diffusion, in which case T^1 is a decreasing function of the external magnetic field. These suggest that this relaxation mechanism is due to the indirect coupling between nuclecs and magnetic impuriteis. The experimental result for x=0.5 at. % is also discussed.
- 一般社団法人日本物理学会の論文
- 1971-12-05
著者
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Masuda Yoshika
Department Of Liberal Arts Aichi Gakuin University
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Hashimoto Masahiro
Department Of Applied Electronic Engineering Osaka Electro-communication University
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